单项选择题
A.10% B.15% C.20% D.30% E.40%
A.10% B.15% C.20% D.25% E.50%
A.0.8g/(kg·D. B.1.0g/(kg·D. C.1.5~2.0g/(kg·D. D.2.5g/(kg·D. E.3.0g/(kg·D.